For a few years I have had it in my mind to replace the standard stepper motors on my CNC Router with Servo Motors. I in fact did this to my Shirline Mill many years ago fitting it with a Servo Motor System. However servo motors are quite expensive and would be a bit of overkill on a home built CNC. There is a lower cost alternative known as Hybrid Closed Loop Stepper Motors. I embarked on this upgrade with some trepidation and there were a few learning bumps along the way, but overall now its completed and working perfectly I am really pleased. As to whether it was all worth the cost and effort only time will tell but at least I have done it.
Some people might ask why do this because the existing CNC Router was working perfectly, the true answer is because I love a challenge and this seemed to be a worthwhile one on my road to one day designing and building my ultimate CNC Router. I hope you enjoy the video.
** Just to correct the Motor part number in the video. They are NEMA23 Motors 573HBM20-"1000" (1000 line encoder,2NM output)

Now a bit of an explanation:
A closed-loop steeper motor system combines benefits of Servo motors and Stepper motors. Functionally, a closed-loop stepper motor system will run more smoothly along with less resistance than a conventional stepper motor setup. As a closed-loop system provides both feedback and control so the closed-loop system will not lose or gain steps.
In addition, a closed-loop system has the advantage of higher torque at low RPMs, higher efficiency, almost zero standby noise plus various other benefits. However all this does come at a cost and complexity, about 3 times that of a conventional Stepper Motor System but a lot less than a full Servo Motor system.

There are many articles related to the differences so I won’t continue except to direct you to a couple of good links.

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